It appears to be fast but not by a lot. It may have something to do with the fact that I am testing it on a top-of-the-line desktop computer. The developer listed 3 of its main features.

Simple, Simple and Simple – It doesn’t do much other than viewing photos. No re-sizing, cropping, etc.

Exif Information – It can display some basic EXIF information.

Portable – It doesn’t need to be installed or mess with Windows regsitry but it can be associated with some file types if you want. It is great if you want to run it off a USB stick.

It has a neat interface that has a main window and thumbnail bar on the side. You can dim the desktop and change the dimming level.

The first issue I noticed was how overly sharp the image appears to be. If you don’t like it, it can be turned off by selecting “Use smooth stretch” option under View menu (right click to access).

The second issue I saw was that it doesn’t seem to be color managed or even understand color profile. I opened a JPEG file with Adobe RGB color profile and the image appeared different (darker red) compared to the same image in color managed viewers. So it is probably OK for casual users but not for photographers who demands accurate colors in their workflow.